Marine Interpretation Message
Issued by NWS

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000
AGPN40 KWNM 280335
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
835 PM PDT SUN JUL 27 2014

.FORECAST DISCUSSION: MAJOR FEATURES/WINDS/SEAS/SIGNIFICANT
.WEATHER FOR THE NORTH PACIFIC N OF 30N AND E OF 150W.

WX PTRN OVR EPAC EXPECTED TO CHANGE LTL OVR FCST PRD WITH HIGH
PRES OVR OR TO THE W AND SW OF PZ5 AREA AND JUST W OF PZ6 AREA
WHILE THERMAL TROF CONTG OVR CA TO SW OREGON. SLO CHANGE EXPECTED
LATE WED INTO FRI AS AN UPR LOW OVR ERN GLF OF AK RETREATS TO W
AND SW ALLOWING UPR RDG OVR WRN STATES TO SW CANADA TO BUILD MORE
WITH ASCD SFC TROF AND RDG TO W TO EXTEND NWD. PREFER 18Z GFS 30M
WNDS WHICH APPR TO MORE CLOSELY MATCH EARLIER MORNING ASCAT
PASSES. HWVR SINCE THEY SHOW LTLCHG FM PREVIOUS RUN PLAN TO USE
EXISTING WND GRIDS BASED ON 12Z GFS. OTRW GFS SPRTD BY MDL
CONSENSUS AND PRELIM EXTENDED PROGS FM WPC ARE CLOSE TO GFS IN ERN
PAC.

SEAS ARE HIGHEST OFF NRN CA CLOSE TO CSTL WTRS WITH MAX 9 OR 10
FT. INITIALLY 18Z ENP WW3 IS CLOSEST TO 00Z SEA STATE ANAL BUT FOR
THE FCST USED SLGTLY HIGHER 12Z ECMWF WAM FOR LATER TONIGHT AND
BYND WHICH ALSO SHOWS GREATER SWD EXTENT OF 6 FT OR HIGHER SEAS.
-----------------------------------------------------------------
PREVIOUS DISCUSSION...

HE SAT IMG HAS SOME CONV CLDS OVR THE FAR SRN WTRS WITH LIGHTNG.
THERE ARE SOME SPAORADIC LGHTNG OVR THE CNTRL CAL WTRS AND THE
RADAR SHOWS SOME TSTMS CELLS OVR THE SRN WTRS. HERMAN NOW
HURRICANE IS STILL BREWING S OF THE FCST WTRS AND THE NHC HAS
MORE INFO UNDER TCMEP3. AT 18Z BROAD HGH PRES TO THE W WITH MAIN
CNTR 1030 MB NR 38N136W AND A SECONDARY CNTR 1025 MB OVR THE WRN
EDGE OF THE NRN WTRS. INLAND LOW PRES 1010 MB OVR AZ HAS A TROF
STRETCHNG NW ACRS CA STATE. THE PRES GRDNT IS STILL VERY WEAK AND
THE MAX OBSVD WINDS ARE ONLY 15 KT. THE LATST ASCAT PASS AT 1824Z
VERIFIES WELL WITH MAX WINDS AT 15 KT.

THE MAIN SYNOP FEATURE ALOFT IS STILL THE HGH PRES WITH ITS RIDGE
OVR THE WTRS. THERE IS SOME ENERGY IN THE GULF OF AK THAT IS
ASCCTD WITH AN AREA OF LOW PRES AT THE SFC. THE PERSISTENCY OF THE
RIDGE OVR THE WTRS WILL THWART ANY EFFORTS FOR THE ENRGY TO GET
INTO THE WTRS THRU THE FCST PRD. AS SUCH...NO MJR CHNGES SHOULD
OCCUR WITH JUST THE RIDGING OVR THE REGION.

THE GLBL MDLS ARE STILL IN GUD AGRMNT AND SO WILL STAY WITH GFS.
IN THE SHORT TERM THE SECONDARY HGH PRES WILL DSIPT WHILE THE MAIN
HGH PRES CNTR WILL REMAIN NRLY STNRY W OF THE SRN WTRS AND THAT
WILL MAINTAIN A RIDGE ACRS THE REGION. THE INLAND TROF WILL ALSO
PERSIST BUT THE GRDNT WILL REMAIN SLACK. THERE WILL BE NO WRNGS
THRU THE FRCST PRD.

.SEAS...THE SEAS ARE HGHST OVR THE SRN WTRS WITH 10 FT PEAKS. THE
SEAS RANGE BTWN 4 AND 8 FT ELSEWHERE. THE LAST JASON PASS OVR THE
REGION WAS AT 0900Z AND HAD SEAS TO 9 FT OVR THE CNTRL CAL WTRS.
THE NWW3 MULTI GRID WV MDL FITS WELL WITH THE SEAS PATTERN AND IS
CLOSE TO THE ECMWFWAVE. SO WILL STAY WITH IT FOR THIS PCKGE.


.EXTRATROPICAL STORM SURGE GUIDANCE...N/A.

.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
     NONE.

.PZ6 CALIFORNIA WATERS...
     NONE.

$$

.FORECASTER BANCROFT/MUSONDA/MUSONDA. OCEAN PREDICTION CENTER.



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